<!-- download.html -->
<!DOCTYPE html>
<html>
<head>
  <meta charset="UTF-8">
  <title>下载</title>
</head>
<body>
  <button onclick="handleClick()">立即下载</button>
</body>
<script>
  const handleClick = () => {
    window.open('/download/1.png');
  }
</script>
</html>